【单选题】【消耗次数：1】
口内最先萌出，不替换任何乳牙的恒牙是（）
①
中切牙
②
侧切牙
③
尖牙
④
第一前磨牙
⑤
第一磨牙
参考答案：
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作为判断下颌中切牙左右的依据的结构是（）
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6～8个月始萌，2岁左右完成
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